According to the doc, she believes the cataract wasn't present from birth for him to have recovered as well and as quickly as he has. She explained that if he had never been able to see from that eye, we would have had to work much longer and harder to restore his vision. She was very excited and relieved at his progress.
Landon still has a cataract in his left eye, however at this point it is not obstructing his vision. The doc said as long as she can see past it, so can he. We'll have to keep an eye on it (no pun intended!) and may need to take action if it becomes problematic later.